Do more side missions get played than threat? Yes. But because there are more opportunities to play them. But I would say almost every time a Threat mission comes up we choose that to clear it. So given a choice between the 2, Threat is far more often selected.
I agree with this. Threat missions tend to be more of a hindrance to the Rebels so they tend to be placed higher in priority when deciding which side mission to do. They get rid of a negative every mission so they are best taken care of early and they also give a possible reward. Compared to just a reward from normal side missions
Only certain character side missions I could see being more important